from string import *

b = raw_input()

dict = {2:'a',
        3:'b',
        5:'c',
        7:'d',
        11:'e',
        13:'f',
        17:'g',
        19:'h',
        23:'i',
        29:'j',
        31:'k',
        37:'l',
        41:'m',
        43:'n',
        47:'o',
        53:'p',
        59:'q',
        61:'r',
        67:'s',
        71:'t',
        73:'u',
        79:'v',
        83:'w',
        89:'x',
        97:'y',
        101:'z'       
        }

primefactors = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37,  41, 43,
                47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101,
                103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
                157, 163, 167, 173, 179, 181, 191, 193, 197, 199]

a = split(b,', ')

c = []
for i in range(0,len(a)):
    n = int(a[i])
    c.append(n)
    
d = []

for id in range(0,len(c)):
    for i in primefactors:
        if c[id] % i == 0:
            d.append(dict.get(i))


print ''.join(d)